Olaf Bergner wrote:
I have - yet again - a minimal deployment scenario (1 service interface, 1 implementing component) I am struggling with. If I do a
merlin -execute conf/component-manager.block
(see below for more info) I get
[INFO ] (kernel): installing: file:/${user.dir}/conf/component-manager.block [INFO ] (components.component-manager): Executing [INFO ] (components.component-manager): Finished executing ... [INFO ] (kernel): dissassembly phase [INFO ] (kernel): disposal phase
i.e. all goes smoothly. If, however, I deploy the block using a custom testcase derived from AbstractMerlinTestCase with only
final public void testAcquisition() throws Exception { final DAOFactoryBuilder builder = (DAOFactoryBuilder) resolve(RES_PATH);
assertNotNull( "resolve(\"" + RES_PATH + "\") returned <null>.", builder); }
added, I get an exception complaining that the xinfo file for the component to be deployed could not be found - that is TypeBuilder fails to locate the corresponding .xinfo file within deployment jar. Needless to say that it is definitely there, as merlin cli well notices. I took great care to ensure that melin cli as well as my testcase do deploy the exact same block containing the exact same info. The merlin.deployment entry in merlin.properties points to file:/${user.dir}/conf/component-manager.block, the block merlin cli swallows without further ado. I manually copied the generated jars to merlin cli's repository, opened them and verified that they are exactly the same as those used by my testcase.
According to the source in TypeBuilder.buildFromXMLDescriptor() the problem might be tracked back to classLoader.getResourceAsStream(classname.xinfo) failing to load the existing xinfo file. But why should this happen?
I'm trying to think why this would happen. Basically if I understand
correctly, Merlin has created a classloader and populated it with the
content you have specified in you block. The scanner then kicks in to
establsh the available components by read the metainfo from the .xinfo
resources. The TypeBuilder is supplied the component class from which
it gets the class's classloader to read the xinfo. In you the classloader
is not finding the xinfo.
This means one thing - the class in question already exists in a parent classloader - but the xinfo is not present in that parent. This suggests that maybe you have a duplication of classes referenced in the jar file component-impl-0.1.jar and classes in target/classes.
classLoader is the classloader that loaded the class itself, it should also load the .xinfo file in the same package. Or is it a classloader issue?
There is clearly a conflict going on at the classloader level. The class exists but its not being loaded from the jar file. To find out what is going on, set the following properties in merlin.properties
merlin.debug = true merlin.info = true
Then run maven with debug enabled:
maven -X test
As the test cases kicks you will see merlin system debug messages and you will also see junit messages. From this you should be able to figer out where the class is comming from.
I wrote an embedded kernel that closely taking AbstractMerlinTestCase as a
blueprint, and it shows the exact same behaviour.
This suggests that there is a duplicate class somewhere in the jars. But I'm just guessing.
Naturally, I would be glad
if anybody could explain to me what's going on here and how I might fix my
kernel.
Lets get some debug traces up and see where things are comming from.
Cheers, Stephen.
Cheers,
Olaf
P.S.: One minor issue: the line
final String message = REZ.getString( "builder.missing-info.error", path );
in TypeBuilder.buildFromXMLDescriptor() should probably be changed to
final String message = REZ.getString( "builder.missing-info.error", classname );
Otherwise, as you will see below, the exception message is a little misleading.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ++++++++
Debug + Stacktrace:
[DEBUG ] (components.classloader.scanner): scanning: file:/C:/Dokumente und Einstellungen/Otto Berg/.maven/repository/manplan-merlin/jars/model-api-0.1.jar [DEBUG ] (components.classloader.scanner): scanning: file:/C:/Dokumente und Einstellungen/Otto Berg/.maven/repository/manplan-merlin/jars/model-spi-0.1.jar [DEBUG ] (components.classloader.scanner): scanning: file:/C:/Dokumente und Einstellungen/Otto Berg/.maven/repository/manplan-merlin/jars/model-impl-0.1.jar [DEBUG ] (components.classloader.scanner): scanning: file:/C:/Dokumente und Einstellungen/Otto Berg/.maven/repository/manplan-merlin/jars/persistence-api-0.1.jar [DEBUG ] (components.classloader.scanner): scanning: file:/C:/Dokumente und Einstellungen/Otto Berg/.maven/repository/manplan-merlin/jars/persistence-impl-0.1.jar [DEBUG ] (components.classloader.scanner): scanning: file:/C:/Dokumente und Einstellungen/Otto Berg/.maven/repository/manplan-merlin/jars/component-api-0.1.jar [DEBUG ] (components.classloader.scanner): scanning: file:/C:/Dokumente und Einstellungen/Otto Berg/.maven/repository/manplan-merlin/jars/component-impl-0.1.jar ---- exception report ---------------------------------------------------------- Exception: org.apache.avalon.merlin.KernelException Message: Install failure: file:/C:/Projekte/OBergner/EclipseWorkspace/manplan-merlin/component/impl/co nf/component-manager.block ---- cause --------------------------------------------------------------------- Exception: org.apache.avalon.composition.model.ModelException Message: Could not create classloader. ---- cause --------------------------------------------------------------------- Exception: org.apache.avalon.composition.model.ModelException Message: Unexpected error while scanning jar file: file:/C:/Dokumente und Einstellungen/Otto Berg/.maven/repository/manplan-merlin/jars/component-impl-0.1.jar ---- cause --------------------------------------------------------------------- Exception: java.lang.Exception Message: Unable to locate resource from which to load info for component implemented by class "manplan/merlin/component/impl/persistence/DefaultDAOFactoryBuilder.xinfo". ---- stack trace --------------------------------------------------------------- java.lang.Exception: Unable to locate resource from which to load info for component implemented by class "manplan/merlin/component/impl/persistence/DefaultDAOFactoryBuilder.xinfo". org.apache.avalon.meta.info.builder.TypeBuilder.buildFromXMLDescriptor(TypeB uilder.java:186) org.apache.avalon.meta.info.builder.TypeBuilder.buildType(TypeBuilder.java:1 04) org.apache.avalon.composition.model.impl.Scanner.addType(Scanner.java:377) org.apache.avalon.composition.model.impl.Scanner.scanJarFile(Scanner.java:25 8) org.apache.avalon.composition.model.impl.Scanner.scanJarFileURL(Scanner.java :239) org.apache.avalon.composition.model.impl.Scanner.scanURL(Scanner.java:197) org.apache.avalon.composition.model.impl.Scanner.scan(Scanner.java:170) org.apache.avalon.composition.model.impl.DefaultClassLoaderModel.<init>(Defa ultClassLoaderModel.java:235) org.apache.avalon.composition.model.impl.DefaultClassLoaderModel.createClass LoaderModel(DefaultClassLoaderModel.java:129) org.apache.avalon.composition.model.impl.DefaultContainmentModel.createConta inmentModel(DefaultContainmentModel.java:464) org.apache.avalon.composition.model.impl.DefaultContainmentModel.createConta inmentModel(DefaultContainmentModel.java:427) org.apache.avalon.composition.model.impl.DefaultContainmentModel.createConta inmentModel(DefaultContainmentModel.java:663) org.apache.avalon.composition.model.impl.DefaultContainmentModel.addContainm entModel(DefaultContainmentModel.java:288) org.apache.avalon.composition.model.impl.DefaultContainmentModel.addModel(De faultContainmentModel.java:282) org.apache.avalon.merlin.impl.DefaultFactory.create(DefaultFactory.java:488) org.apache.avalon.merlin.unit.AbstractMerlinTestCase.setUp(AbstractMerlinTes tCase.java:198) junit.framework.TestCase.runBare(TestCase.java:125) junit.framework.TestResult$1.protect(TestResult.java:106) junit.framework.TestResult.runProtected(TestResult.java:124) junit.framework.TestResult.run(TestResult.java:109) junit.framework.TestCase.run(TestCase.java:118) junit.framework.TestSuite.runTest(TestSuite.java:208) junit.framework.TestSuite.run(TestSuite.java:203) org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRu nner.java:392) org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner. java:276) org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner .java:167) ---------------------------------------------------------------------------- ----
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ++++
component-manager.block:
<container name="components">
<services> <service type="manplan.merlin.component.api.ComponentManager"> <source>component-manager</source> </service> </services>
<classloader> <classpath> <repository> <resource id="manplan-merlin:model-api" version="0.1"/> <resource id="manplan-merlin:model-spi" version="0.1"/> <resource id="manplan-merlin:model-impl" version="0.1"/> <resource id="manplan-merlin:persistence-api" version="0.1"/> <resource id="manplan-merlin:persistence-impl" version="0.1"/> <resource id="manplan-merlin:component-api" version="0.1"/> <resource id="manplan-merlin:component-impl" version="0.1"/> <resource id="log4j:log4j" version="1.2.8"/> <resource id="hibernate:hibernate" version="2.1.1"/> <resource id="commons-collections:commons-collections" version="3.0-dev2"/> <resource id="dom4j:dom4j" version="1.4"/> </repository> </classpath> </classloader>
<component name="component-manager" class="manplan.merlin.component.impl.DefaultComponentManager" activation="startup"> </component>
</container>
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ++++++++
manplan/merlin/component/impl/DefaultComponentManager.xinfo (for what it's worth):
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE type PUBLIC "-//AVALON/Type DTD Version 1.0//EN" "http://avalon.apache.org/dtds/meta/type_1_1.dtd"; >
<type> <info> <name>component-manager</name> <version>0.1.0</version> <lifestyle>singleton</lifestyle> </info> <services> <service type="manplan.merlin.component.api.ComponentManager"/> </services> </type>
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Stephen J. McConnell mailto:[EMAIL PROTECTED]
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